Mention the class of whales?

Mention the class of Cycas.

Mention the classes of Phylum Echinodermata with one example for each .

Mention the classes of the phylum Mollusca or Echinodermata. Give their distinguishing features and examples.

Mention two classes of nucleases. Suggest their respective roles.

What are the types of RNA? Mention the role of each class of RNA.

Which of the following diagrams correctly represents the relationship among the classes: Whales, Fishes, Crocodiles

Whale is

Whale is